From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E3470CA9EB9 for ; Tue, 22 Oct 2019 14:03:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B0EE721783 for ; Tue, 22 Oct 2019 14:03:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388985AbfJVODI (ORCPT ); Tue, 22 Oct 2019 10:03:08 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:46383 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388967AbfJVODI (ORCPT ); Tue, 22 Oct 2019 10:03:08 -0400 Received: by mail-il1-f200.google.com with SMTP id y5so9451760ilm.13 for ; Tue, 22 Oct 2019 07:03:07 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=X8R9No+KYRblmHd6HBmjv/vYFX9sgoKPVl5b2HVYjsw=; b=jsfkRGwswdIrlS/2O27Qj28h1ZPYJRr6JwsB2fer5/0sUx0g7Vu49gJLweMLuxLhbD GVCMA/RzCnJ95qf3Z2wWNMG82SKKTM8dXgWBWqwnv/24UDBgNfUG2lfezOs2JKRrjysI ePj/S42AOKtVXeW/iilN+ExaBlDreeNpATn5J1R2VdF1FHzdcgbdjDpvxBTsWeKwMcCc TsGDeTOEUXFGHJBjYquea5g7qGkIBJETTz+6JoA3koa85UUtcS4Tv/+6UxTvFisvKzkt EfILal3qoiLEtO5BbYdP3buZAjsWnGFEENVX7G23McPGgN/12GinzRAgOMvPmc5/Ekg0 guVA== X-Gm-Message-State: APjAAAVV5phUIwzqCcsJ/6STxU18PMHA+Uouw/kndOHK3vGrGBr9G8hL 6o1Fhr7EzbNiuXyUdrt9+rG5J1wo3xTafE5k3phGfSVOZmsP X-Google-Smtp-Source: APXvYqy9Lrb+tqJJGeEY5yKqbiUG8/YR6RXMSFJXZ6uHkr8DS0g+4onKOt30+gN8f921O1j6CCOlHO85Czr9m/g1vP4nzjfri3pG MIME-Version: 1.0 X-Received: by 2002:a02:b817:: with SMTP id o23mr3974902jam.42.1571752986849; Tue, 22 Oct 2019 07:03:06 -0700 (PDT) Date: Tue, 22 Oct 2019 07:03:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000074bc3105958042ef@google.com> Subject: KASAN: use-after-free Read in nf_ct_deliver_cached_events From: syzbot To: coreteam@netfilter.org, davem@davemloft.net, fw@strlen.de, kadlec@netfilter.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pablo@netfilter.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: netfilter-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: a6fcdcd9 Add linux-next specific files for 20191021 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=111b7fcf600000 kernel config: https://syzkaller.appspot.com/x/.config?x=32434321999f01e9 dashboard link: https://syzkaller.appspot.com/bug?extid=c7aabc9fe93e7f3637ba compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c7aabc9fe93e7f3637ba@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:53 [inline] BUG: KASAN: use-after-free in nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:58 [inline] BUG: KASAN: use-after-free in __nf_ct_ext_find include/net/netfilter/nf_conntrack_extend.h:63 [inline] BUG: KASAN: use-after-free in nf_ct_ecache_find include/net/netfilter/nf_conntrack_ecache.h:35 [inline] BUG: KASAN: use-after-free in nf_ct_deliver_cached_events+0x5c3/0x6d0 net/netfilter/nf_conntrack_ecache.c:205 Read of size 1 at addr ffff88806bb2dc04 by task syz-executor.2/27585 CPU: 0 PID: 27585 Comm: syz-executor.2 Not tainted 5.4.0-rc4-next-20191021 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129 __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:53 [inline] nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:58 [inline] __nf_ct_ext_find include/net/netfilter/nf_conntrack_extend.h:63 [inline] nf_ct_ecache_find include/net/netfilter/nf_conntrack_ecache.h:35 [inline] nf_ct_deliver_cached_events+0x5c3/0x6d0 net/netfilter/nf_conntrack_ecache.c:205 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:65 [inline] nf_confirm+0x3d8/0x4d0 net/netfilter/nf_conntrack_proto.c:154 ipv4_confirm+0x14c/0x240 net/netfilter/nf_conntrack_proto.c:169 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:262 [inline] NF_HOOK_COND include/linux/netfilter.h:295 [inline] ip_output+0x40d/0x670 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out+0xbb/0x1b0 net/ipv4/ip_output.c:125 ip_send_skb+0x42/0xf0 net/ipv4/ip_output.c:1558 udp_send_skb.isra.0+0x6d5/0x11b0 net/ipv4/udp.c:891 udp_sendmsg+0x1e8f/0x2810 net/ipv4/udp.c:1178 inet_sendmsg+0x9e/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 kernel_sendmsg+0x44/0x50 net/socket.c:678 rxrpc_send_data_packet+0x10cb/0x36b0 net/rxrpc/output.c:416 rxrpc_queue_packet net/rxrpc/sendmsg.c:220 [inline] rxrpc_send_data+0x1097/0x4130 net/rxrpc/sendmsg.c:427 rxrpc_do_sendmsg+0xb8e/0x1d5f net/rxrpc/sendmsg.c:736 rxrpc_sendmsg+0x4d6/0x5f0 net/rxrpc/af_rxrpc.c:585 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2312 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2414 __do_sys_sendmmsg net/socket.c:2443 [inline] __se_sys_sendmmsg net/socket.c:2440 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2440 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a59 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f18acb64c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459a59 RDX: 0000000000000001 RSI: 0000000020005c00 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f18acb656d4 R13: 00000000004c74b8 R14: 00000000004dd1a8 R15: 00000000ffffffff Allocated by task 27585: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_krealloc+0x84/0xc0 mm/kasan/common.c:565 __do_krealloc mm/slab_common.c:1655 [inline] krealloc+0xa6/0xd0 mm/slab_common.c:1710 nf_ct_ext_add+0x2c7/0x630 net/netfilter/nf_conntrack_extend.c:74 nf_ct_ecache_ext_add include/net/netfilter/nf_conntrack_ecache.h:55 [inline] init_conntrack.isra.0+0x5ed/0x11a0 net/netfilter/nf_conntrack_core.c:1470 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1547 [inline] nf_conntrack_in+0xd94/0x1460 net/netfilter/nf_conntrack_core.c:1707 ipv4_conntrack_local+0x127/0x220 net/netfilter/nf_conntrack_proto.c:200 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:262 [inline] __ip_local_out+0x403/0x870 net/ipv4/ip_output.c:114 ip_local_out+0x2d/0x1b0 net/ipv4/ip_output.c:123 ip_send_skb+0x42/0xf0 net/ipv4/ip_output.c:1558 udp_send_skb.isra.0+0x6d5/0x11b0 net/ipv4/udp.c:891 udp_sendmsg+0x1e8f/0x2810 net/ipv4/udp.c:1178 inet_sendmsg+0x9e/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 kernel_sendmsg+0x44/0x50 net/socket.c:678 rxrpc_send_data_packet+0x10cb/0x36b0 net/rxrpc/output.c:416 rxrpc_queue_packet net/rxrpc/sendmsg.c:220 [inline] rxrpc_send_data+0x1097/0x4130 net/rxrpc/sendmsg.c:427 rxrpc_do_sendmsg+0xb8e/0x1d5f net/rxrpc/sendmsg.c:736 rxrpc_sendmsg+0x4d6/0x5f0 net/rxrpc/af_rxrpc.c:585 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2312 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2414 __do_sys_sendmmsg net/socket.c:2443 [inline] __se_sys_sendmmsg net/socket.c:2440 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2440 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 27585: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 nf_ct_ext_destroy+0x2ab/0x2e0 net/netfilter/nf_conntrack_extend.c:38 nf_conntrack_free+0x8f/0xe0 net/netfilter/nf_conntrack_core.c:1418 destroy_conntrack+0x1a2/0x270 net/netfilter/nf_conntrack_core.c:626 nf_conntrack_destroy+0xed/0x230 net/netfilter/core.c:600 nf_conntrack_put include/linux/netfilter/nf_conntrack_common.h:34 [inline] nf_conntrack_put include/linux/netfilter/nf_conntrack_common.h:31 [inline] nf_ct_resolve_clash net/netfilter/nf_conntrack_core.c:915 [inline] __nf_conntrack_confirm+0x21ca/0x2830 net/netfilter/nf_conntrack_core.c:1038 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline] nf_confirm+0x3e7/0x4d0 net/netfilter/nf_conntrack_proto.c:154 ipv4_confirm+0x14c/0x240 net/netfilter/nf_conntrack_proto.c:169 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:262 [inline] NF_HOOK_COND include/linux/netfilter.h:295 [inline] ip_output+0x40d/0x670 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out+0xbb/0x1b0 net/ipv4/ip_output.c:125 ip_send_skb+0x42/0xf0 net/ipv4/ip_output.c:1558 udp_send_skb.isra.0+0x6d5/0x11b0 net/ipv4/udp.c:891 udp_sendmsg+0x1e8f/0x2810 net/ipv4/udp.c:1178 inet_sendmsg+0x9e/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 kernel_sendmsg+0x44/0x50 net/socket.c:678 rxrpc_send_data_packet+0x10cb/0x36b0 net/rxrpc/output.c:416 rxrpc_queue_packet net/rxrpc/sendmsg.c:220 [inline] rxrpc_send_data+0x1097/0x4130 net/rxrpc/sendmsg.c:427 rxrpc_do_sendmsg+0xb8e/0x1d5f net/rxrpc/sendmsg.c:736 rxrpc_sendmsg+0x4d6/0x5f0 net/rxrpc/af_rxrpc.c:585 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:658 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2312 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2414 __do_sys_sendmmsg net/socket.c:2443 [inline] __se_sys_sendmmsg net/socket.c:2440 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2440 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88806bb2dc00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 4 bytes inside of 128-byte region [ffff88806bb2dc00, ffff88806bb2dc80) The buggy address belongs to the page: page:ffffea0001aecb40 refcount:1 mapcount:0 mapping:ffff8880aa400700 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002506788 ffffea00026a2c48 ffff8880aa400700 raw: 0000000000000000 ffff88806bb2d000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806bb2db00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806bb2db80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff88806bb2dc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806bb2dc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806bb2dd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.